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tem_osu
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[SOLVED] Vertical Circular Motion & Centripetal Acceleration
1) A car travels at a constant speed around a circular track whose radius is 2.1 km. The car goes once around the track in 410 s. What is the magnitude of the centripetal acceleration of the car?
a=(v^2)/r
a=((2100/410)^2)/2100=0.01249 - wrong answer
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2)A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to five times her weight as she goes through the dip. If r = 20.5 m, how fast is the roller coaster traveling at the bottom of the dip?
F-mg = m(v^2/r)
v^2 = (20.5)(9.8)
v = 14.17 m/s - wrong answer
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Please help me, I don't know what I'm doing wrong.
Homework Statement
1) A car travels at a constant speed around a circular track whose radius is 2.1 km. The car goes once around the track in 410 s. What is the magnitude of the centripetal acceleration of the car?
Homework Equations
a=(v^2)/r
The Attempt at a Solution
a=((2100/410)^2)/2100=0.01249 - wrong answer
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Homework Statement
2)A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to five times her weight as she goes through the dip. If r = 20.5 m, how fast is the roller coaster traveling at the bottom of the dip?
Homework Equations
F-mg = m(v^2/r)
The Attempt at a Solution
v^2 = (20.5)(9.8)
v = 14.17 m/s - wrong answer
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Please help me, I don't know what I'm doing wrong.